this weekend to my children, and was reminded of a great blog post by Nancy Duarte about leveraging your audience's anticipation in your presentation. Let them do a bit of the work as well, rather than just sitting down while being spoon-fed with content.The "slide" with the grinning George is a more powerful one than Martha walking away to get a towel while the information conveyed is the same.
The images are scans from this book. Recommended for any parent.